A school I'd love to be at just reposted an ad for a position. I interviewed for this position a year and a half ago, but due to budgetary constraints, the position was pulled. I led to believe at the time that the interview went really well - so I'm hopeful about how things could turn out (even though I've since taken a position elsewhere - another complication to my situation!). Does anyone have any advise on how to handle this? Do I acknowledge my previous interview in the cover letter? Should I e-mail the previous search committee chair who I was in contact with so much during the last search? Thanks!!

Agreed. If it went as well as you said it did and you're fairly confident that not landing the position was due to budgetary constraints, I think you should get in touch. You already went through the agony and uncertainty of this particular interview once - use that to your advantage! That said, even without the contact, your bit of experience then should help you in round 2.

^ditto. I would reach out to the chair and whomever you had the most contact with at the last round of interviews and express interest. I might do the app first, then contact them to let them know you've sent your materials.